برآورد بیوماس روزمینی جنگل در جنگل های هیرکانی با استفاده از داده های ماهواره ای

محورهای موضوعی : منابع طبیعی

محدثه قنبری مطلق ¹ , ساسان بابایی کفاکی ² , اسداله متاجی ³ , رضا اخوان ⁴

1 - دکتری جنگلداری، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.
2 - دانشیار، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران. *(مسوول مکاتبات)
3 - استاد، دانشکده منابع طبیعی و محیط زیست، دانشگاه آزاد اسلامی، واحد علوم و تحقیقات، تهران، ایران.
4 - دانشیار پژوهش، مؤسسه تحقیقات جنگلها و مراتع کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، تهران، ایران.

تاریخ دریافت : 1397/03/02 تاریخ پذیرش : 1397/06/27 تاریخ انتشار : 1399/05/01

کلید واژه: ایران, جنگل, شاخص‌های پوشش‌گیاهی, بیوماس, تصاویر SPOT,

چکیده مقاله :

زمینه و هدف: اهمیت جنگل های شمال ایران به عنوان یکی از مهمترین و بزرگترین ذخایر کربن و نقش آن در ترسیب کربن اتمسفری در کشورمان برکسی پوشیده نیست. مطالعه بیوماس روزمینی این جنگل ها به عنوان یک ضرورت تلقی می گردد. در سال های اخیر مطالعات زیادی با استفاده از تکنولوژی سنجش از دور و شاخص های مختلف برای محاسبات بیوماس روزمینی جنگل ها انجام شده است. هدف پژوهش برآورد بیوماس جنگل های هیرکانی درشمال ایران با استفاده از اطلاعات ماهواره SPOT6 می باشد. روش بررسی: بیوماس روزمینی این جنگل ها با استفاده از تصاویر ماهواره SPOT6 و مدل های رگرسیونی در سه منطقه انتخابی در استانهای شمالی و در 2 دامنه ارتفاعی در تابستان 1395 بررسی شد. پس از آن که مقادیر متوسط بیوماس روزمینی بر حسب تن در هکتار با استفاده از برداشت های زمینی محاسبه گردید، از 3 شاخص پوشش گیاهی NDVI، RVI و TVI برای برآورد بیوماس بر اساس تصاویر ماهواره ای استفاده شد. یافته ها: نتایج نشان داد که رابطه بین مقادیر بیوماس روزمینی و شاخص های پوشش گیاهی یک رابطه خطی بوده و شاخص NDVI در سطح تمامی مناطق بیشترین سطح معنی داری و بالاترین ضریب همبستگی با بیوماس روزمینی را داشته است. بنابراین به منظور نقشه سازی بیوماس روزمینی از روابط رگرسیونی این شاخص استفاده شد. نتیجه گیری: بر اساس نتایج این تحقیق مقادیر بیوماس بین سه منطقه اصلی تحقیق و در طبقات ارتفاعی میان بند و بالابند دارای تفاوت های نسبتاً زیادی می باشند. بیشترین میزان بیوماس در منطقه اسالم و دامنه ارتفاعی بالابند دیده شده است.

چکیده انگلیسی:

Background and Objective: The importance of the northern forests of Iran as one of the most important and largest carbon reserves and its role in atmospheric carbon sequestration in our country is evident. The study of the above ground biomass of these forests is considered as a necessity. In recent years, many studies have been carried out using remote sensing technology and various indices for forest above ground biomass estimations. The purpose of this study is estimating Hyrcanian forests above ground biomass in northern Iran using satellite data (SPOT 6). Method: In this research, above ground biomass of these forests using SPOT satellite images and regression models in three selected regions in the Northern provinces (Asalem, Sardaraboud and Kordkuy) and in 2 altitudes were investigated. After calculating the average above ground biomass per hectare using field plots, three vegetation indices NDVI, RVI and TVI were used to estimate biomass based on satellite imagery. Findings: The results showed that the relationship between above ground biomass values and vegetation indices was linear and the NDVI has the highest level of significance in all parcels and has the highest correlation coefficient with above ground biomass. Therefore, regression relations with NDVI were used in order to map the above ground biomass. Discussion and Conclusion:  Based on the results of this study, the above ground biomass values between the three main study areas and in the elevation classes between the high lands and the middle land have a relatively large difference. The highest biomass in the Asalem region and the high lands has been observed.  

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